Github user davebshow commented on the issue: https://github.com/apache/tinkerpop/pull/478 Well I implemented this API for gremlin-python. There is one major problem: side effects. Since the current side effect API is designed to be synchronous (calling `run_sync`), it cannot be used inside a coroutine, as demonstrated by this [test](https://github.com/apache/tinkerpop/blob/54fac5146a5ac067e75f2fbfe135fae2da641c35/gremlin-python/src/main/jython/tests/driver/test_driver_remote_connection.py#L210). This is problematic for a Tornado or Asyncio based driver. I think in the future we should consider the possibility that the `promise()` method return a `AsyncSideEffect` object so the end user can leverage the async techniques with side effects.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---